Actually I just saw the Mythbusters on sneezing properly. Please, do not carry a cloth hanky, or your hand and don't use either to block your sneeze. According to their experiment, the best method is sneezing into the crook of your elbow. This was the least germ spreading method, and didn't contaminate your hand.

The cloth hanky just becomes a germ vector all its own. Use regular Kleenex to mop up, and throw it away.

To kill the urge to sneeze, pinch the soft tissue above the nostrils with your thumb and index finger. Maintain steady but firm pressure for 10-15 seconds and you'll find the urge will dissipate and go away. Helpful in a movie theater